What factor can contribute to the increase of obesity rates in populations?

The increase in obesity rates in populations is significantly influenced by the high availability of processed foods. Processed foods are often calorie-dense but nutrient-poor, containing high levels of sugar, unhealthy fats, and additives that can lead to overconsumption. As these foods are more accessible and convenient than whole, unprocessed options, people are more likely to choose them, which contributes to an increase in overall caloric intake. This convenience, paired with aggressive marketing and lower costs compared to fresh, healthy foods, further exacerbates the problem, making it easier for individuals to develop unhealthy eating habits that can lead to obesity.

In contrast, regular physical activity and healthy dietary practices can help manage weight or reduce the risk of obesity, and an increase in sleep quality is generally beneficial for maintaining a healthy weight, as adequate rest is essential for metabolic health and overall well-being. Thus, while these factors contribute to fostering a healthier population, they do not directly contribute to increasing obesity rates as the high availability of processed foods does.